MIL-A-21180D
1.2.3 Radiographic grade. The radiographic inspection quality grades shall be as follows
(see Table II):
Grade
Description
A
A highly stressed casting or area of a
casting for critical application.
B
A premium grade of casting for
critical applications or specified area
of a casting with low margins of
safety.
C
A high quality grade of casting for
general applications or area of a
casting with average margin of
safety.
D
A casting or area of a casting
subjected only to low stresses.
1.2.4 Mechanical property class. The mechanical property class of each casting or area of a
casting shall be as specified in Table III and IV, as applicable, unless mechanical property
requirements are specified on the engineering drawing. Classes are identified as Class 1, 2 or 3
(for designated areas) or 10, 11 or 12 (for any area), as applicable, for the alloy specified.
2. APPLICABLE DOCUMENTS
2.1 Government documents.
2.1.1 Specifications and standards. Unless otherwise specified, the following specifications
and standards of the issue listed in that issue of the Department of Defense Index of Specifications
and Standards (DoDISS) specified in the solicitation form a part of this specification to the extent
specified herein.
SPECIFICATIONS
MILITARY
MIL-H-6088
-
Heat Treatment of Aluminum Alloys
MIL-I-6866
-
Inspection, Penetrant Method of
MIL-I-25135
-
Inspection Materials, Penetrants
2
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